from tkinter import *
print("Ведите начальную координату X:")
X = int(input())
print("Ведите начальную координату Y:")
Y = int(input())
print("Ведите коэфицент увеличения N:")
N = int(input())

coords = [0, 0, 10, 0, 10, 10, 20, 10, 20, 20, 20, 30, 10, 30, 10, 20, 0, 20]

if N == 0 and X>=0 and X<=500 and Y>=0 and Y<=500:
 pass
else:
    if N > 0 and 0*N+X>=0 and 0*N+Y>=0 and 20*N+X<=500 and 20*N+Y<=500:
     pass
    else:
     if N < 0 and 20*N+X>=0 and 20*N+Y>=0 and 0*N+X<=500 and 0*N+Y<=500:
        pass
     else:
      print('Размер фигуры превышает максимальный размер поля')
      exit()
root = Tk()
root.title("ИТ марафон")
root.geometry("500x500")
canvas = Canvas(bg="white", width=500, height=500)
canvas.pack(anchor=CENTER, expand=1)
canvas.create_polygon(coords[0] *N+X, coords[1] *N+Y,
 coords[2] *N+X, coords[3] *N+Y,
 coords[4] *N+X, coords[5] *N+Y,
 coords[6] *N+X, coords[7] *N+Y,
 coords[8] *N+X, coords[9] *N+Y,
 coords[10]*N+X, coords[11]*N+Y,
 coords[12]*N+X, coords[13]*N+Y,
 coords[14]*N+X, coords[15]*N+Y,
 coords[16]*N+X, coords[17]*N+Y,
 fill="blue")
root.mainloop()